Cumaru (pronounced Ku-mah-rue) also known as Brazilian Teak is one of the densest hardwoods available for outdoor construction, second only to ipe. It is very dense, which is why it is ideal for exterior use as it is mildew and decay resistant. It is often used for decking, flooring, railroad ties as well as other purposes. Just like ipe, cumaru has a A1 fire rating, does not scratch or splinter easily, it does not become hot in the sun, and has a high friction coefficient, making it perfect for outdoor and seaside construction